An apparatus for positioning a cardiac lead in the vasculature of the heart includes a guide catheter, a sleeve and a guidewire. The guide catheter has an inflatable balloon at its distal end and a central lumen open distally to the exterior of the catheter for injection of dye or advancement of a guidewire...http://www.google.de/patents/US6122552?utm_source=gb-gplus-sharePatent US6122552 - Insertion apparatus for left ventricular access lead
